Kubernetes project

This repo houses the files that are being used to build a kubernetes cluster lab. This will be done with multiple tools (most IaC):

• QEMU/KVM - This is the virtualization technology that is being used to build the cluster on top of.
• Packer - For building out the initial VM image. That image will then be used to clone a master node and worker nodes.
• Ansible - Multiple ansible runs. One in the packer provisioner to install the common files that are needed by all nodes in the cluster. Another run after terraform to install the remaining files that are specific to the master and worker nodes. Also, the second ansible run will initialize the cluster, and join the worker nodes to it.
• Terraform - For provisioning out the actual nodes in the cluster. This is done using the base image built by packer. This also creates a variable file for the second ansible run.

Instructions for use

• Forke or clone the repo
• Download ubuntu 22.04 server ISO and update iso_url and iso_checksum appropriately
• Generate a key for ansible user: ssh-keygen -t ed25519 -C ansible -f cloudinit/ansible
• Replace public key in user-data file
• Ensure output directory parent exists, or modify packer_base.pkr.hcl and variables.tf to point to a desired location. Packer build will fail if output directory itself exists, so just make sure it's parent exists.
• Run packer init packer_base.pkr.hcl to install the plugin, followed by packer build packer_base.pkr.hcl to get the base image built out.
• cd into terraform directory and run terraform init to download the plugins, then terraform plan to see what will be done. Finally a terraform apply will spin up 3 servers to operate as a cluster.
• cd into the ansible directory and execute the ansible run command: ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -i hosts --private-key ../cloudinit/ansible site.yml

Steps completed

• The code is written, and confirmed that packer can build the base image.
• Confirmed that the ansible provisioner from packer works properly.
• Terraform can now build the nodes without errors.
• Second ansible run completes without errors

TODO

• Fix networking between nodes
• Figure out how to automate the entire process. In hopes of removing the manual execution of terraform and the second ansible run.

Issues

• Networking between the nodes in the cluster is not functioning properly. Need to investigate and determine why this is happening.